<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
        <div id="app">
            <h2>{{firstName}} {{lastName}}</h2>
            <!-- 
                mustache语法支持简单的表达式
             -->
            <h2>{{firstName + lastName}}</h2>
            <h2>{{counter * 2}}</h2>
        </div>
        <script src="../js/vue.js"></script>
        <script>
            const app = new Vue({
                el: '#app',
                data: {
                    message: '你好啊',
                    firstName: 'jack',
                    lastName: 'rose',
                    counter: 100
                }
            })
        </script>
    </body>
</html>